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Specifies how to render the endpoints of the path when stroking.
The default line cap style is CairoLineCap::BUTT .
CairoLineCap::BUTT Start(stop) the line exactly at the start(end) point
CairoLineCap::ROUND Use a round ending, the center of the circle is the end point
CairoLineCap::SQUARE Use squared ending, the center of the square is the end point